/** * FIXME: Describe <code>rewrite</code> method here. * * @param reader an <code>IndexReader</code> value * @return a <code>Query</code> value * @exception IOException if an error occurs */ Query* RangeQuery::rewrite(IndexReader* reader){ BooleanQuery* query = _CLNEW BooleanQuery; TermEnum* enumerator = reader->terms(lowerTerm); Term* lastTerm = NULL; try { bool checkLower = false; if (!inclusive) // make adjustments to set to exclusive checkLower = true; const TCHAR* testField = getField(); do { lastTerm = enumerator->term(); if (lastTerm != NULL && lastTerm->field() == testField ) { if (!checkLower || _tcscmp(lastTerm->text(),lowerTerm->text()) > 0) { checkLower = false; if (upperTerm != NULL) { int compare = _tcscmp(upperTerm->text(),lastTerm->text()); /* if beyond the upper term, or is exclusive and * this is equal to the upper term, break out */ if ((compare < 0) || (!inclusive && compare == 0)) break; } TermQuery* tq = _CLNEW TermQuery(lastTerm); // found a match tq->setBoost(getBoost()); // set the boost query->add(tq, true, false, false); // add to query } }else { break; } _CLDECDELETE(lastTerm); } while (enumerator->next()); }catch(...){ _CLDECDELETE(lastTerm); //always need to delete this _CLDELETE(query); //in case of error, delete the query enumerator->close(); _CLDELETE(enumerator); throw; //rethrow } _CLDECDELETE(lastTerm); //always need to delete this enumerator->close(); _CLDELETE(enumerator); return query; }
Query* PrefixQuery::rewrite(IndexReader* reader){ BooleanQuery* query = _CLNEW BooleanQuery(); TermEnum* enumerator = reader->terms(prefix); Term* lastTerm = NULL; try { const TCHAR* prefixText = prefix->text(); const TCHAR* prefixField = prefix->field(); const TCHAR* tmp; size_t i; int32_t prefixLen = prefix->textLength(); do { lastTerm = enumerator->term(); if (lastTerm != NULL && lastTerm->field() == prefixField ){ //now see if term->text() starts with prefixText int32_t termLen = lastTerm->textLength(); if ( prefixLen>termLen ) break; //the prefix is longer than the term, can't be matched tmp = lastTerm->text(); //check for prefix match in reverse, since most change will be at the end for ( i=prefixLen-1;i!=-1;--i ){ if ( tmp[i] != prefixText[i] ){ tmp=NULL;//signals inequality break; } } if ( tmp == NULL ) break; TermQuery* tq = _CLNEW TermQuery(lastTerm); // found a match tq->setBoost(getBoost()); // set the boost query->add(tq,true,false, false); // add to query } else break; _CLDECDELETE(lastTerm); } while (enumerator->next()); }_CLFINALLY( enumerator->close(); _CLDELETE(enumerator); _CLDECDELETE(lastTerm); );